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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f32f4fcc0173a0e9f0298ef0f889b00f7ca789129e160b3a32d1fde51a8b96d' 
  AND token = 'DzuTASgL+PO+bvEQztribLoxLMS7JfqGwLSCxSE6GkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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