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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b29e09b677bd9b596a797ab858eafb4b70788ccd5f136fc1f07e3b80f7895f' 
  AND token = 'toozNUc1hYUPj0iX3Vrfnret6x5ihkNXL86ekoZ6iOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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