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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806813bfe7b4d68539201bd0ce7fbcc93e90a8066a93a5728c8ff146bb986ca9' 
  AND token = 'PNYqQv80Xi2LxiNJsEI8R9+TYERj08afPFit96W7nfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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