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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca5b71a91c5baa05a90cf2df2a50e0371106e3f974ce3c33c8dbface7f0b70f' 
  AND token = 'W97YYuGEY8hCuv7Pi1tRJHP/7TS1LqUT3OwSTu11PmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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