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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f9cdea43148aada2a93201ab00a157d2adfa5c3492a8c118a6b3119efc9c83' 
  AND token = 'nfflq0UCs6Uz0kuQIs1trMkIYoraAISh+bqXOask8rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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