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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bcf0a337c12bc7f9d48f82d08cc44ffc00ae27e78f3ac496f9e692f0997735' 
  AND token = 'MUICcRO9gwBRKm/ci/SKe/CjPFNfdU2hiftr/fKPsco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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