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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361b428bb1e6ea62e7f1282a0e1dbbdaab7732cb55bdae71df10ca5108505f6f' 
  AND token = 'DKL0k5i5BWloRKi4jXdWHwXUJLJqjHGB7cL5uLFVnC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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