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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a914e8ed12de89b217da0b73320c3e885cb035be074d7708f522e73cdee804' 
  AND token = 'sk3oprfJGZVNl7nqIc44pd0j7czTt07Nev9EiEAqYSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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