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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bee8d4051610a3a3fe803a9ddade98572c1b95f703af588a3bf16b6d546a1c' 
  AND token = '0PF9L5hpnCYrdgSWK3pZoMVQCDtCRWaSRuAVL5+86Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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