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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e84ca9936b4a43cb8769b4c26ff7769c6c5ae4277e571896e486cd0174d149c' 
  AND token = 'z43rnscp7yCmZHOxZLzeVK9OxaQK5SzY1s1GQS1j0ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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