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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d469156aa47698cd168b43b7956585a27a3c456875285cb988c2ffca9c2214' 
  AND token = 'AWL6t/2cpCgpEPXUmg39LVAIXWrWCT75Ho2la5x1smM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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