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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04826b94f2cbd94c0b004f3253ed1a0d3ce6ffc9772f5ea586457b5b6280fd6d' 
  AND token = '8la7+FWbtyB78lj/pM5nukuY5kjn6wztJQ/MVO/1deg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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