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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8dae03c403d101c1fa89db23bcee5144459136c2a628665a1fdc1fe53ad117' 
  AND token = 'CHHaR08Wm5kpYnyDOzuTq+b2zgwOnkTOopp8VmOczOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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