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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c6850def285913f3bd46f427494e9a582ed01f65aafd3445438fb0b336c679' 
  AND token = 'u+YpfrINI1E3OUM+10StwrDdxjl8F2bqa3vWQKxGv18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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