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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53bc89c32e2e25efe42789b0066a15a3a0a67ff14731cf24f950a468e6aa937e' 
  AND token = 'HY1PunuoTGows7BkmU1RElBbqzNqT78+oZ6c9CTpGxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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