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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55119558c21c0cfbbe00a13e283ed9079278dbebbe164d4f328fdbc269ebcc39' 
  AND token = 'SriSDgo3s/x20MmpAe3WJIrtlm0/QU6rOoFoXEOyiJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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