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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99289dedce651048e7d15155dff6935e29594b045964dd0ca2af6b8ef5b0b73' 
  AND token = 'ASvBvST6SAUKj0v19ksGQARVbHnnJGC/4VqLt3Xryoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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