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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8ed1bd866ca5f651d8bf3bc2a09b8a51fd7b657dea40e7d4159e7d23997121' 
  AND token = '+9fluRQeehCvNU4Yh0TYHXg8843HatBwL31mEnDSMX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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