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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5be4771710a12dba3124e44b554375d13318b520d4746002822e99f4ade3f38' 
  AND token = 'A2hz47DfiKX+Z3T/G2gWvSMmtc64DLG2GmBhEwQ2j6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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