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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2a1583cfed8e8e36e51b7db9e342a5686a63ec6177d5c84bad563a918c7eb5' 
  AND token = 'mhoDaiQP6Jvf73v3EpY6lP9l5KSLI1zl+fSv3T44Z6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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