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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99137a7a9812114d85affb0fbed58e9429ca2c6819423561c7f0a9b628cd5050' 
  AND token = 'YWq+bg8B8Balc4i1oDxi++JyJLLUSycmivH/yOAeA/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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