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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2238c4576419ebb7ea14c16546735ae267b61642f0b79cf08daf61b5414b0d00' 
  AND token = 'ArfFYJYmVJqO4z5QCQI6Sba7kO+gJvGNKboVgeAlfAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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