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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8883f23c5f7b421a7989f31ab5e954ed0d2cdab193a4ada3e2cf1de3eda4e51e' 
  AND token = '50m8HWuDolL2DW8zWNST/0e1w2gT/AQPmEQlC3IR1U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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