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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2089e15da0bc552cc1f8676812761b73eba8436b5f98409dfa9433d74ed73e' 
  AND token = 'iMuRPP/g4DfiUfXKtrPZjVNEMzI0ndCSj6Hjx2u1wT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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