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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f95f7ec2834ecc044ef214bd95bda8783b643003086dbc54aec98f20259bbf' 
  AND token = 'u4IW0wt9EaORvJ7SvDN9rH+PMkco9IJn5hEmDV3W33o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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