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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcf57425e293a9b753319a30a783a2d8ba54790d1d3521a61f1ec6b8d58cbf3' 
  AND token = 'vMGY5ovb7w9hLl18D3/ynbL+LDx55QdBEZWFnw86BEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}