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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df00d5f0d226d42c62a5a6850885ed801f06eb08a1e4f600c859dd9ecfdfc081' 
  AND token = 'hbZ87q1iDdS/wCZCrWRX+lhi82A2d5SYRgatl9X0Q6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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