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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4196bc8c2bae3e1cf0c8f8e1f3b11cb6247305dfaa662eecc098a9b1566c7544' 
  AND token = 'T6y+/k9VysmnK8Yo7910liVDa7b4ELU78AULjjP5ojM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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