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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5547ea2e443b42b5e8e928a99e02e04af3922b2f1ec327aaaec392c46c6076a6' 
  AND token = '7VjZmxQbtRr+NCPCtlfcEsyLeU3Qrix11VUqdOF9SQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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