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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a126eb02867502522edeccc82d06c2b1a066e0f7b22a0c7ef249e57c7446bb08' 
  AND token = '3ibCXAoGcBx62fzcyu3bvPu5qa77oluITVT3dFTdGq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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