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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8699c25de20ed994a3a9a2eb1f5532730831c381e0aa02a12bdb6d5e18ade029' 
  AND token = 'Ud+B5plvNrsjFnV1TXg86QI9O7jz4R9L6xNEFA+y8Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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