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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934e30c07c2412eaca49588d51abc77eb02d47314aa39e2764da44aa1269ee51' 
  AND token = 'k+GGgFrMm9W5B+Ti+wsLQ4t974bZ+rhFzlObFIQgpkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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