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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ff51374ad129e0efc7f04ee857cf715f4da537f7c3a0eb457bc2951ed5c7be' 
  AND token = 'CoZRQbCeRUVw7A+xN9Uw59ABbJVeTVp06zEt4awUi6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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