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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f8ed6a5c5923d1c31404d96f5a28db177ca1e7497aa0d466fc15b2093f9556' 
  AND token = '/cNW4qsbAzg7ATQoQEBalbYgr9XyJV3GDXbyhSEoQXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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