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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46e23b75b4d4b9dad93becaa08f0df91f62128707d7b9e8965793f45c41d15ba' 
  AND token = 'R86ryrRZLZFURqqklyd+z3GH90EZ/eFhcuEnvOrvXks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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