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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3c897b70c18242f683537d39b764341711488859fe955cfdeb579fcfd6e8b1' 
  AND token = 'ROh51thtLAXB542qZYaG8bM3BroACtIyyLtUPqrSxrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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