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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6570ac064a1d58886fd92fc5cb2954b3f6f9e99e8fd62817ecfd786d93cb6ba9' 
  AND token = '97vdGEXksKE2tzV4oKepyEK5igUpUYkwpazPDYgf/nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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