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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87813e459bbb73d4db3ae0bcbcceadb50220dbd160500103284d98cbc8006e4' 
  AND token = 'KuY5yEghSMqSPFNKsiqQJbe8hOYEYZ4eHc9VxXn7N2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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