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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fb56a3267547c659bfa8cedc0dab49d7761ec6640fcb5225949fb96ba44b8b' 
  AND token = 'LHIe2q9f2tsxeFmAyPZ8/QtdXtrMlXcbNOQb1sphcnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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