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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde7c918cd5e1e22896dd2e0bfa36b702d82024c218be18855306d51abf2404b' 
  AND token = 'C9Ax9XYY/k00Z198JtDZzWg+mL4TzSHKDidpfyb3m3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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