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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8765051a56a91aee7135e7b8624c4dd35bc0b1083641a1d67317c322ca017a' 
  AND token = 'ZswWkcmXYswodd0KshkNHIKwfQR4iGBPJRU4X/aNR2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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