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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e4aebd95f4d2b4d7eced2c0e9185d4da2600c597bef6706a031eb283dc3860e' 
  AND token = 'gw/8nLubLSlWr4U33/16vshEXV5U+oMXJigy0wxkhEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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