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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1cdbf4717717abf5b53027e677883af5a1e688a5f0ed7b5e3309465cfdee67' 
  AND token = 'Wx1CY/WVNBHEhm6AAhFdoZYhpA20gf4Oq99gMpYds0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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