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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03ee59ffbf8d5e6a2e486343d53c3131ee7abb2a2570ec294ef93c14187ee2c' 
  AND token = 'OjdM1fnV89D0VbSHvvvdGXTdkDcPPv/n2baWsZZE1qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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