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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb626aeb19b5557270d17b61d310a5cb87b0b66b87cd17386e1076e508b7b322' 
  AND token = 'UBT/0VgDe77ZtPCvEUWnsBiRTzn4liOyId2qU4aSTF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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