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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638d4fa76d83adba9cc8b1f3d40b8d22e99ea121d1caac7048d7567ba25e8db6' 
  AND token = 'tFdYHTH8aoT8rNDnTP0GJRl0WsMPp1fSZX/rohFWgUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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