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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd700084f0e4d65dc5a27fa71ca012f683fd9da4d9c6252babe9e4f84e099e98' 
  AND token = '+hiPsJssSdPebM+pUKE6U0sOdAuO4AizPWq5cJ514gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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