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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ac43c1fecba374779106a267517794319bb4d5c903e297994e86832137988b' 
  AND token = 'nrMbXOaHOCGF1AeXAzjyXRVetKsJ7I7qwg6iMsSgOf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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