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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbe2d88173b4ca1381686a73e7d823901e0e2786d507fd87d025c764608bb73' 
  AND token = 'lkyq1eHKJqRPckoRf2nLiFdBWlRixVyFifx6y4wJg/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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