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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc380c69005a350b558805a57d3d4811f2e37574a9d308485d6c48fce1f97a0' 
  AND token = 'YjL9VpCroab6O48IMcdV4Gf9NEpCuF4wcyiwggDw2Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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