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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2f96139de69b55b73774f57b653a2c650f5154e65db63970cf3a7c42f4afe2' 
  AND token = '03rKlr5qrmGEZIyjDrAEMW1Oq2vIEXgPpRZZiDmvOzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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