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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6e1a4b025c73319d9de6e8d91f10af88492e81eaa65ec93e9eff8d22cc2b6b' 
  AND token = '/pnz+Akedn5TC16r/jfXEFWT8KTackCRrm4QE/4EdDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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