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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a7ec49007c8216a5e7e841515dc3bcd4340d08aeb4bcf617240aecf5695c40' 
  AND token = 'e3pSflP2vvZX8w1SBKSC9hd094lKTXpfEVdUyhGOckA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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