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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dd07a58315ae89821bb3491a5714739102fd05a987fcc5f18e40d674d4570c' 
  AND token = '/yvtIQW2d9yk43v0jC/HOcL23oG4Q1pY47wf5T4Z9sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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