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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '357a932c1695a8b8cec34cde4e936a6791d3607c26ac413bdd68a0196fcaf63c' 
  AND token = '6kzcGJSkb2LAeO6aOHOuoxdqRZIAA0EYR0Pz3uUD0Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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