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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71fc81885e9e27ab29b837c82dfb047a5108c6ee0eb80165b39fa6d08d5618b' 
  AND token = 'Rph2AH97oN54wYIQ9coIdJICgzg3CO40FuG9JZfBflI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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